Am i close to gettign my period yet?

ok so i was jus wondering if i am close, im 13 years old. i have a 30A cup size for my bra..i know small :\ i also have some hair in my armpits and down there. I get a lot of discharge, ALOT like everyday and i can fell it coming out sometimes :o its clear or white sometime light yellow. i get headaches sometime, cramps, and lower back pains sometimes. so how close am i to my period ?? like how much time is left ??